Colors

The following color constants can be used to access the colors in the FLTK standard color palette:

• FL_BLACK - the default label color (0)

• FL_RED

• FL_GREEN

• FL_YELLOW

• FL_BLUE

• FL_MAGENTA

• FL_CYAN

• FL_WHITE - the default background for text

• FL_SELECTION_COLOR - change to dark blue for Windows style

• FL_GRAY - the default color.

In addition there are two inline functions to allow you to select grays or colors from the FLTK colormap:

Fl_Color fl_gray_ramp(int i)

Returs a gray color. Returns black for zero, returns white for FL_NUM_GRAY (which is 24) minus 1. To get the closest to an 8-bit gray value 'I' use fl_gray_ramp(I*FL_NUM_GRAY/256)

Fl_Color fl_color_cube(int r, int g, int b)

Returns a color out of the color cube.

• r must be in the range 0 to FL_NUM_RED (5) minus 1.

• g must be in the range 0 to FL_NUM_GREEN (8) minus 1.

• b must be in the range 0 to FL_NUM_BLUE (5) minus 1.

To get the closest color to a 8-bit set of R,G,B values use fl_color_cube(R*FL_NUM_RED/256, G*FL_NUM_GREEN/256, B*FL_NUM_BLUE/256);